But for evidence of the Keto Diet’s more immediate effects, Noakes brings up South African athlete Bruce Fordyce, 60, who won the country’s biggest ultramarathon, the 56-mile Comrades, a record nine times. He ate high-carb his whole life, eventually putting on weight and becoming insulin resistant. Recently, though, he switched to a high-fat diet—and has regained his former waistline and dramatically improved his marathon times. Little by little, according to Noakes, we’re learning. “This is the single most important health intervention we can make as doctors,” he says. “And as nations.”

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Secondly, glucose is not the only source of energy for your body. The entire point of the Keto diet is that the body can use fat as a fuel source. Yes, you’ll still need glucose for certain things, but you eat protein and a minimal amount of carbs. The great majority of your energy needs are met by ketones. I don’t dismiss the concerns about accessing muscle for glucose, and I’d be interested in studies involving low intensity weight training on Keto to see if it helps with muscle retention. I think you’d probably have to carefully manage your protein levels as well.

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I tried the ketogenic diet and it really helped me even out my energy levels and I don’t grave sugar anymore. I had issues absorbing my B vitamins. I had high candida and l-acidophylis levels. I was also addicted to sugar. I started this 3 years ago, and since about a year ago, I’ve added fruit. Now I enjoy a little rice and potatoes as well. I even had a bite of chocolate cake and didn’t die. I started out at 112, lost 10 pounds within a month and have slowly gained most of it back. I am happy I did it, but I will be more confident to add more carbs, although it will mostly be in the form of more fruit and starchy veggies. Thanks for your article. 

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Great article! anything that the sh** bomb in the first paragraph has to be good! Plenty of scientific studies, we can click on if we choose to, but this was simple and easy to understand. Don’t let the wiener-heads, who want to pick out one little thing and go to town with it, drag you down. I was looking for some easy to understand pros and cons of Keto and that’s exactly what you gave me. The best thing is it supports what I’ve been telling clients and my fellow meatheads at the gym all along. Like anything else in life, nutrition, work, exercise, family, marriage (God forbid I ever do that again) and so on, sustainability and success require balance. Personally, I’m a 40-40-20 hardliner, but only because that is what works best for me.

Total carbs is not a precise indicator of the carb content of a food. When you see “total carbs” on a food label, the number beside it represents the cumulative total of grams of dietary fiber, sugar, and sugar alcohol that are in that food item or beverage. Net carb content, on the other hand, relates to the carb content of the food that is digested at four calories per gram and impacts your ketones levels.

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